Forbes looked at how much leading recording artists generated in U.S. music sales and North American concert grosses in 2007. Our estimates, which don't calculate how much income each artist pocketed, include concert revenue data from Pollstar, music sales tallies from Nielsen SoundScan and pricing information from NPD Group. Forget the year's hot new acts. Veterans like the Police and Celine Dion were among the biggest commercial forces of 2007. (Forbes)